Talk Composites - The Forum for Advanced Composites

MTI hose + Valve

http://www.talkcomposites.com/Topic41557.aspx

By Francis - 12/19/2022 8:07:54 PM

Within a few week we gonna start with the infusion of a racing canoe. It's my biggest infusion project for so far, so I want to use all the tools to make the infusion successful.
1: When I use an MTI hose around the flange of the canoe, is it necessary that I cut the infusion mesh a few centimeters lower then where the MTI hose is positioned?
2: When I install an MTI valve and the canoe is completed infused, do I clamp also the inlet tube first and after a few minutes the vacuum line? (when I don't have any leaks in the bag of course)
I made already a few tests and always the part shows dry spots when I let the pump running after infusion (without MTI hose and Valve.)
I work with flax composite
By Francis - 12/20/2022 1:10:36 PM

 
Warren (Staff) - 12/20/2022 9:19:50 AM
Its not necessary to cut the mesh short.  Its not so much of an issue with flax as flax flows well anyway.    The resin will stop when it hits the hose. 

Normally once the resin line has reached the hose fully, the MTI hose does not really flow anything so at this point clamp the vacuum line.  Clamp the resin feed a couple of minutes later - the valve will limit the resin flow once saturated. 

Dry spots with a pump running and no MTI are because in that situation, you need a resin break otherwise resin gets sucked into the catch pot. 

Thanks, we know what to do!